I started tuning with the oem flywheel. But the Fx300 started to slip @ 14.7 psi. So I bought a CC stg 4 (6 puck sprung) disc and their 8lb flywheel as well.
the oem flywheel held 14.7 psi till 8600.
But with the 8lb flywheel I had to add a lot of preload and still need to add to hold boost.
But my supposition was the same as aLmK's by the time.
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